Your always could testify against you. All the police have to do is download vehicle parameters from the ECU/ECM to get info. When you crash in an accident, the computer automatically records last last 15 seconds before the crash. That way you can't lie about speeding, etc. Toyota used that the lawsuits they had against them with the accelerator pedal issue. They even went so far as to have NASA engineers go through all the data. Insurance companies use this for information about clients driving habits.
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